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Bel Fuse Inc. Class B Common Stock BELFB

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Market dataready · fetched 2026-11-13T02:14:28.369Z

Delta surfaceAlpaca · derived absolute-delta buckets · 2026-11-20

Calculation methodology

Options historyIV: ThetaData historical Greeks, equal-weight mean of call/put 50-delta IV across the next four listed Friday-cycle expirations, including holiday shifts verified against ThetaData’s market calendar. Missing inputs leave gaps. Skew: equal-weight mean of put minus call IV across those four expirations. IV-implied move history: mean of each expiration’s average call/put IV multiplied by the square root of remaining calendar days divided by 365.25; percentage of spot, not a quoted straddle premium.

History data

PriceAlpaca · sip · 2026-11-12T21:00:03.662983394Z

FundamentalsSEC EDGAR · ready · as of 2026-09-30 · fetched 2026-11-13T02:14:27.676397+00:00

Share price$233.49
1D+5.2%
AH$221$225$229$232$2365:30 AM6:30 AM9:00 AM1:00 PM2:00 PMBELFB
Sold putSold callAH

Bel Fuse Inc. Class B Common Stock options

Live interpolated BELFB call and put midpoint premiums by absolute delta.Bel Fuse Inc. Class B Common Stock$4.55$8.73$12.92$17.11$21.29$184.63$207.55$230.46$253.38$276.3020Δ25Δ30Δ35Δ40Δ45Δ50Δ55Δ60Δ65Δ70Δ75Δ80ΔOPTION PRICELive BELFB spot · $233.49BELFB PRICE$5.00$5.00$5.00$5.03$5.25$6.20$7.14$8.09$9.07$10.88$12.69$14.50$16.66$5.00$5.02$5.19$5.59$5.98$7.19$8.55$9.92$11.28$13.18$15.19$17.19$20.09
PutsCheap0.86×
CallsCheap0.68×
SkewBullish-0.87 pp
Implied moveBearish±$15.70
TiltBearish7.9% PUT
Table
Values and derived Greeks for the plotted delta buckets
DeltaCallsPuts
Pseudo strikeIVB/E movePseudo strikeIVB/E move
20Δ285.81145.0%24.6%204.22121.7%14.7%
25Δ262.94106.5%14.8%214.7093.3%10.2%
30Δ250.8082.2%9.6%221.4475.4%7.4%
35Δ244.5967.2%6.9%225.3966.8%5.9%
40Δ239.4955.6%4.8%229.3458.1%4.3%
45Δ237.0954.5%4.2%232.0956.8%3.7%
50Δ234.7053.4%3.6%234.5956.8%3.2%
55Δ232.3052.3%3.0%237.1056.9%2.7%
60Δ229.9051.2%2.3%239.6056.9%2.2%
65Δ227.2951.7%2.0%242.3956.5%1.8%
70Δ224.6952.2%1.7%245.2356.0%1.5%
75Δ222.0852.8%1.3%248.0655.5%1.1%
80Δ219.1753.4%1.0%251.7255.9%0.8%

20Δ

Calls
Pseudo strike
285.81
IV
145.0%
B/E move
24.6%
Puts
Pseudo strike
204.22
IV
121.7%
B/E move
14.7%

25Δ

Calls
Pseudo strike
262.94
IV
106.5%
B/E move
14.8%
Puts
Pseudo strike
214.70
IV
93.3%
B/E move
10.2%

30Δ

Calls
Pseudo strike
250.80
IV
82.2%
B/E move
9.6%
Puts
Pseudo strike
221.44
IV
75.4%
B/E move
7.4%

35Δ

Calls
Pseudo strike
244.59
IV
67.2%
B/E move
6.9%
Puts
Pseudo strike
225.39
IV
66.8%
B/E move
5.9%

40Δ

Calls
Pseudo strike
239.49
IV
55.6%
B/E move
4.8%
Puts
Pseudo strike
229.34
IV
58.1%
B/E move
4.3%

45Δ

Calls
Pseudo strike
237.09
IV
54.5%
B/E move
4.2%
Puts
Pseudo strike
232.09
IV
56.8%
B/E move
3.7%

50Δ

Calls
Pseudo strike
234.70
IV
53.4%
B/E move
3.6%
Puts
Pseudo strike
234.59
IV
56.8%
B/E move
3.2%

55Δ

Calls
Pseudo strike
232.30
IV
52.3%
B/E move
3.0%
Puts
Pseudo strike
237.10
IV
56.9%
B/E move
2.7%

60Δ

Calls
Pseudo strike
229.90
IV
51.2%
B/E move
2.3%
Puts
Pseudo strike
239.60
IV
56.9%
B/E move
2.2%

65Δ

Calls
Pseudo strike
227.29
IV
51.7%
B/E move
2.0%
Puts
Pseudo strike
242.39
IV
56.5%
B/E move
1.8%

70Δ

Calls
Pseudo strike
224.69
IV
52.2%
B/E move
1.7%
Puts
Pseudo strike
245.23
IV
56.0%
B/E move
1.5%

75Δ

Calls
Pseudo strike
222.08
IV
52.8%
B/E move
1.3%
Puts
Pseudo strike
248.06
IV
55.5%
B/E move
1.1%

80Δ

Calls
Pseudo strike
219.17
IV
53.4%
B/E move
1.0%
Puts
Pseudo strike
251.72
IV
55.9%
B/E move
0.8%

Options history

IV · four-Friday blend53.94%
Daily close
BELFB48.3%62.4%76.5%2026-08-14: 50.29%2026-08-17: 52.96%2026-08-18: 56.06%2026-08-19: 59.33%2026-08-20: 64.71%2026-08-21: 52.07%2026-08-24: 53.37%2026-08-25: 53.09%2026-08-26: 52.25%2026-08-27: 51.84%2026-08-28: 51.65%2026-08-31: 52.37%2026-09-01: 51.59%2026-09-02: 53.55%2026-09-03: 53.33%2026-09-04: 52.98%2026-09-08: 55.09%2026-09-09: 54.80%2026-09-10: 55.03%2026-09-11: 52.74%2026-09-14: 56.56%2026-09-15: 59.53%2026-09-16: 63.23%2026-09-17: 67.77%2026-09-18: 53.73%2026-09-21: 55.34%2026-09-22: 54.20%2026-09-23: 53.95%2026-09-24: 54.09%2026-09-25: 53.43%2026-09-28: 54.77%2026-09-29: 55.00%2026-09-30: 54.54%2026-10-01: 54.47%2026-10-02: 53.00%2026-10-05: 53.80%2026-10-06: 52.38%2026-10-07: 52.94%2026-10-08: 54.24%2026-10-09: 53.93%2026-10-12: 58.32%2026-10-13: 60.39%2026-10-14: 65.15%2026-10-15: 74.58%2026-10-16: 59.98%2026-10-19: 59.32%2026-10-20: 59.23%2026-10-21: 59.31%2026-10-22: 60.92%2026-10-23: 61.85%2026-10-26: 62.05%2026-10-27: 61.19%2026-10-28: 62.31%2026-10-29: 53.47%2026-10-30: 53.94%Aug 14Sep 23Oct 30
55 observations2026-08-14 — 2026-10-30
Table
DateIV (%)
50.29%
52.96%
56.06%
59.33%
64.71%
52.07%
53.37%
53.09%
52.25%
51.84%
51.65%
52.37%
51.59%
53.55%
53.33%
52.98%
55.09%
54.80%
55.03%
52.74%
56.56%
59.53%
63.23%
67.77%
53.73%
55.34%
54.20%
53.95%
54.09%
53.43%
54.77%
55.00%
54.54%
54.47%
53.00%
53.80%
52.38%
52.94%
54.24%
53.93%
58.32%
60.39%
65.15%
74.58%
59.98%
59.32%
59.23%
59.31%
60.92%
61.85%
62.05%
61.19%
62.31%
53.47%
53.94%